[vtkusers] Clipping of a volume

[Dean N. Williams]

Thanks Dan...

-Dean

> Well, is your vtkPlane Axis Aligned? If it is, then try looking into 
> the vtkExtractVOI filter, which will return a vtkStructuredPoints for you.
>
> If the plane is arbitrarily positioned in space, then you need to 
> think about what you want to do with all the "clipped" cells along the 
> edge.  That's why the result is an vtkUnstructuredGrid, because of the 
> prisms, triangles, and tetrahedra that occur along angular cuts.  You 
> would need to find a way to return this to a vtkStructuredPoints, 
> probably with a vtkProbeFilter & a blank vtkImageData 
> (vtkStructuredPoints) of the desired size..  But this will be 
> extremely slow and wasteful of memory.  Best to just use the 
> vtkUnstructuredGrid as-is :)
>
> On 2/10/06, *Rhys Thomas* <rgt at informatics.bangor.ac.uk 
> <mailto:rgt at informatics.bangor.ac.uk>> wrote:
>
>     Hello all,
>
>         I was wondering if anyone could provide some hints on the
>     following
>     problem: I wish to clip an instance of/ vtkStructuredPoints/ using a
>     /vtkPlane/. I want the output to be an instance of
>     /vtkStructuredPoints/
>     so that I can insert it into my graphics pipeline in place of another
>     instance of /vtkStructuredPoints/ because I am performing other
>     operations on the data (changing opacity of certain voxels, contrast
>     stretching). I am currently using /vtkRenderer::AddVolume /to add a
>     /vtkVolume/ to the pipeline. I have tried variations of /vtkCutter,
>     vtkClipVolume /and/ vtkProbeFilter, /but with disappointing results.
>     Does anyone have  any suggestions as to the quickest (i.e. least
>     processor intensive) solution to this problem?
>
>     Thanks
>
>     Rhys
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>
>
> -- 
> Randall Hand
> Visualization Scientist,
> ERDC-MSRC Vicksburg, MS
> Homepage: http://www.yeraze.com
>
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